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Shoe Size Proportionality

Adina and Lynn are going rock-climbing and need to rent special shoes. Lynn is normally size 9 and knows that her rock-climbing shoe-size is 42. If Adina is normally size 6, what size rock-climbing shoes should she rent assuming shoe size is directly proportional to rock-climbing shoe size?

1
2
3
+
4
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6
-
7
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9
$\frac{a}{b}$
.
0
=
%

$a^n$
$a^{\circ}$
$a_n$
$\sqrt{}$
$\sqrt[n]{}$
$\pi$
$\ln{}$
$\log$
$\theta$
$\sin{}$
$\cos{}$
$\tan{}$

$($
$)$
$[$
$]$
$\cap$
$\cup$
$,$
$\infty$

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